Description

Consider the following dataclass hierarchy:

abstract class Base { } class Thing extends Base { }

This is a custom resolver for the abstract class Base:

class BaseResolver implements GraphQLResolver<Base> { public boolean isActive(Base base) { return true; } }

Root query resolver with datafetcher that returns our concrete class Thing:

class RootQueryResolver implements GraphQLQueryResolver { public Thing getThing() { return new Thing(); } }

Expected behavior

The following schema should work fine and return true for queries on the active field:

type Query { thing: Thing! } type Thing { active: Boolean! }

Actual behavior

graphql.kickstart.tools.resolver.FieldResolverError: No method or field found as defined in schema [...] 

Steps to reproduce the bug

1. Create a resolver for a supertype (class or interface) with any datafetcher
2. Have a query return a subclass of that type
3. Try building the schema